<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录</title>
    <!-- 引入axios -->
    <script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
    <!-- 引入Vue -->
    <script src="https://cdn.staticfile.org/vue/2.6.14/vue.min.js"></script>
</head>

<body>
<div>
    <center>
        <div>
            <h1>登录页面</h1>
            <input type="text" v-model="user.username" placeholder="用户名">
            <input type="password" v-model="user.password" placeholder="密码">
            <input type="button" value="登录" @click="login()">
        </div>
    </center>
</div>

    <script>
        let v = new Vue({
            el: "body>div",
            data: {
                user:{
                    username:"",
                    password:""
                }
            },
            methods: {
                login(){
                    // 发出post异步请求
                    axios.post("/login",v.user).then(function (response) {
                        if (response.data==1){
                            // 用户名和密码都正确
                            alert("登录成功!")
                        }else if (response.data==2){
                            // 用户不存在
                            alert("用户名不存在!")
                        }else {
                            // 密码错误
                            alert("密码错误!")
                        }
                    })
                }
            }
        })
    </script>
</body>

</html>